A Transformer Operation Test System Based on Data Analysis
By introducing variable ratio error, phase angle error and no-load abnormal test in the transformer operation test system, combined with winding, core and external interference analysis, the problem of lack of comprehensive analysis and targeted analysis in the existing technology is solved, and the problem of achieving the Comprehensive evaluation of the operating status of the transformer and fault location improve the safety of the power system and the reliability of the transformer.
Patent Information
- Application Number
- CN202411441095.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2044-10-16
AI Technical Summary
The existing transformer operation test methods only focus on specific monitoring indicators, ignore the relationship and comprehensive analysis between different indicators, making it difficult to accurately evaluate the overall performance and health of the transformer, and lack targeted analysis, which leads to the difficulty of potential failures. Timely discovery increases the possibility of failure.
A transformer operation test system based on data analysis was designed, including variable ratio error testing module, phase angle error testing module, no-load abnormality testing module, transformer operation abnormality identification module and abnormal cause analysis module, through winding , core and external interference analysis to identify specific reasons for abnormal operation.
A comprehensive analysis of the operating status of the transformer is achieved, potential faults are discovered in a timely manner, the reliability of the transformer and the safety of the power system are improved, and the maintenance and improvement of specific components or links can be carried out, providing clear optimization goals.
Smart Images
Figure CN118962564B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of transformer operation testing, and relates to a transformer operation testing system based on data analysis. Background Art
[0002] The instrument transformer is an electronic component widely used in power systems. It uses the principle of electromagnetic induction to detect and convert current, voltage and power. During operation, the instrument transformer may have various faults, such as ratio error, phase angle error and no-load anomaly, which may affect the normal operation of the power system and the safety of the equipment. By real-time monitoring and accurate analysis of the operating data of the instrument transformer, potential faults can be discovered in time, thereby ensuring the safety and reliability of the power system. Therefore, the operation test of the instrument transformer based on data analysis is of great significance.
[0003] In the prior art, there are also related schemes for transformer operation testing. For example, the invention patent application for a method for monitoring abnormal operation of a current transformer with publication number CN117572327A collects vibration and noise data of the current transformer under various operating conditions by arranging ultrasonic sensors. The abnormal information of the current transformer is compared with the characteristic signal through the centralized control and diagnosis center to locate the fault type, and the information is output to the panel through the alarm outlet, and sent to other monitoring systems through the communication system. The entire system is trained and tested by initially collecting normal signals and importing abnormal characteristic signals, and the abnormal characteristic information is added and updated according to the various types of fault information collected on site that have been input.
[0004] Although the above schemes have proposed some solutions for the operation test of the transformer, there are still certain limitations: on the one hand, the existing transformer operation test only focuses on the operation of specific monitoring indicators, but ignores the comprehensive analysis of different operation monitoring indicators of the target transformer. This analysis method is difficult to grasp the relationship and comprehensive performance between different indicators, and thus cannot accurately evaluate the overall performance and health of the transformer. Different monitoring indicators often reflect the characteristics of different aspects of the transformer. The normal operation of a single indicator does not mean that the transformer has no other potential problems. The lack of comprehensive analysis may result in some potential fault hazards not being discovered in time, increasing the possibility of transformer failure.
[0005] On the other hand, the existing transformer operation test does not conduct targeted analysis on the specific detection indicators of the target transformer when analyzing the causes of abnormalities. This analysis method is difficult to accurately lock in the specific factors that actually cause the transformer abnormality. This not only wastes time and energy, but may also delay the timely handling of transformer failures and increase the risk of power system operation. It cannot provide an effective basis for the optimization and improvement of transformers. Only by analyzing specific detection indicators can we have a deep understanding of the performance and existing problems of transformers in different aspects, and then make targeted improvements, designs and optimization adjustments. Summary of the invention
[0006] In view of this, in order to solve the problems raised in the above background technology, a transformer operation test system based on data analysis is now proposed.
[0007] The purpose of the present invention can be achieved through the following technical solutions: A transformer operation test system based on data analysis, including: a ratio error test module, used to perform a ratio error test on a target transformer and analyze the ratio error of the target transformer.
[0008] The phase angle error test module is used to perform a phase angle error test on a target transformer and analyze the phase angle error of the target transformer.
[0009] The no-load abnormality test module is used to perform a no-load abnormality test on a target transformer and analyze the no-load abnormality of the target transformer.
[0010] The transformer operation abnormality identification module is used to determine whether the target transformer has an operation abnormality. If so, it identifies the specific operation abnormality direction and analyzes the cause of the transformer operation abnormality.
[0011] The transformer operation abnormality cause analysis module is used to analyze the evaluation of the operation abnormality cause pointed to by the target transformer operation abnormality.
[0012] The transformer abnormal operation cause analysis module includes a winding operation quality analysis unit, a core operation quality analysis module, an external interference analysis module and an abnormal operation cause identification unit.
[0013] The winding operation quality analysis unit is used to obtain the winding operation quality data of the target transformer and analyze the winding operation quality of the target transformer.
[0014] The core operation quality analysis unit is used to obtain the core operation quality data of the target transformer and analyze the core operation quality of the target transformer.
[0015] The external interference analysis unit is used to obtain external interference data of the target transformer and analyze the external interference situation of the target transformer.
[0016] The abnormal operation cause identification unit is used to analyze the abnormal operation cause evaluation situation pointed out by the abnormal operation of the target transformer and provide feedback.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) When testing the operating status of a transformer, the present invention performs ratio error, phase angle error and no-load abnormality tests, and then analyzes the operating status of the target transformer. This analysis method can more comprehensively understand the operating status of the transformer and avoid the one-sidedness of single indicator analysis. A comprehensive operating status analysis of the transformer can timely discover potential fault hazards. When early signs of ratio error, phase angle error or no-load abnormality appear, appropriate measures can be taken to investigate and handle them to avoid further development of the fault, thereby improving the reliability of the transformer and the safety of the power system.
[0018] (2) When analyzing the cause of abnormal operation of a transformer, the present invention analyzes the winding operation quality, core operation quality and external interference of the target transformer, and then identifies the specific cause of abnormal operation. This analysis method can deeply understand the working state inside the transformer, make the analysis scope more comprehensive, and avoid missing factors that may cause abnormalities. This analysis method can locate the cause of the abnormality to a specific component or link, providing a clear target for subsequent maintenance and improvement. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.
[0020] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.
[0021] Figure 2 This is a connection diagram of a transformer operation abnormality cause analysis module provided by the present invention. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] See also Figure 1As shown, the present invention provides a transformer operation test system based on data analysis, which includes a transformation ratio error test module, a phase angle error test module, a no-load abnormality test module, a transformer operation abnormality identification module and a transformer operation abnormality cause analysis module, wherein the transformer operation abnormality cause analysis module includes a winding operation quality analysis unit, a core operation quality analysis unit, an external interference analysis unit and an operation abnormality cause identification unit.
[0024] The connection mode between the modules is as follows: the ratio error test module, the phase angle error test module and the no-load abnormality test module are all connected to the transformer operation abnormality identification module, and the transformer operation abnormality identification module is connected to the transformer operation abnormality cause analysis module.
[0025] See also Figure 2 As shown, the connection between the various units is as follows: the winding operation quality analysis unit, the core operation quality analysis unit and the external interference analysis unit are all connected to the abnormal operation cause identification unit.
[0026] The transformation ratio error test module is used to perform a transformation ratio error test on a target transformer and analyze the transformation ratio error of the target transformer.
[0027] In a preferred embodiment of the present invention, the analysis of the ratio error of the target transformer requires the construction of the ratio error index of the target transformer, and the specific analysis steps are as follows: multiple ratio error tests are performed on the target transformer, and a test voltage is applied once to the target transformer in each ratio error test, which is recorded as , and measure the monitoring voltage of the secondary measurement of the target transformer of each ratio error test, recorded as ,in Indicates the number of the ratio error test. , Indicates the number of ratio error tests.
[0028] It should be noted that the reason for performing ratio error test on the target transformer is that the main function of the transformer is to convert high voltage or large current into low voltage or small current in a certain ratio, so as to facilitate the use of measurement and protection equipment. The ratio error test can verify whether the actual ratio of the transformer is consistent with the nominal value, ensuring that the electric quantity on the primary and secondary sides can be accurately converted according to the established ratio.
[0029] Using the formula The target transformer ratio error index is obtained by analysis. ,in Indicates the preset standard ratio.
[0030] It should be noted that the standard transformation ratio is obtained in the following manner: the standard transformation ratio is usually marked on the product nameplate of the transformer. When installing and using the transformer, the standard transformation ratio can be determined by directly checking the information on the nameplate.
[0031] The phase angle error test module is used to perform a phase angle error test on a target mutual inductor and analyze the phase angle error of the target mutual inductor.
[0032] In a preferred embodiment of the present invention, the phase angle error of the target transformer needs to be analyzed to construct a phase angle error index of the target transformer. The specific analysis steps are as follows: multiple phase angle error tests are performed on the target transformer, and the phase of the primary and secondary voltages of the target transformer corresponding to each phase angle error test is measured using a phase meter, which are recorded as , ,in Indicates the phase angle error test number, , Indicates the number of phase angle error tests.
[0033] It should be noted that the reason for the phase angle error test on the target transformer is that in the power system, the phase relationship between voltage and current is crucial for power measurement, power quality analysis, and relay protection. As an important part of the measurement and protection equipment, the phase angle error of the transformer will directly affect the accurate measurement of the voltage and current phase relationship. Through the phase angle error test, the phase angle deviation introduced by the transformer in the process of transmitting signals can be determined, so as to correct the measurement results and improve the accuracy of the measurement.
[0034] Using the formula The phase angle error index of the target transformer is obtained by analysis. ,in Indicates the preset allowable phase angle error, Represents a natural constant.
[0035] The no-load abnormality test module is used to perform a no-load abnormality test on a target transformer and analyze the no-load abnormality of the target transformer.
[0036] In a preferred embodiment of the present invention, the analysis of the no-load abnormality of the target transformer requires the construction of a no-load abnormality index of the target transformer, and the specific analysis steps are as follows: multiple no-load abnormality tests are performed on the target transformer, and an open-circuit operation is performed on the primary measurement of the target transformer corresponding to each no-load abnormality test, and at the same time, the no-load current of the secondary measurement of the target transformer corresponding to each no-load abnormality test is collected, which is recorded as ,in Indicates the number of the no-load abnormality test, , Indicates the number of no-load abnormality tests.
[0037] It should be noted that the reason for performing no-load abnormality test on the target transformer is that no-load abnormality test can help prevent power accidents. If the transformer fails or its performance degrades, it may cause inaccurate measurement of the power system, malfunction of the protection device, and other problems, thus causing power accidents. Through testing, the problems of the transformer can be discovered in time, and appropriate measures can be taken to repair them, avoiding power accidents caused by transformer failures.
[0038] Using the formula The no-load abnormality index of the target transformer is obtained by analysis ,in Indicates the preset no-load current threshold.
[0039] It should be noted that the no-load current threshold of the target transformer is set based on the fact that the enterprise has accumulated rich experience in transformer operation during the long-term production and operation process. Based on this experience, the no-load current threshold can be reasonably set.
[0040] The transformer operation abnormality identification module is used to determine whether the target transformer has an operation abnormality. If so, it identifies the specific operation abnormality direction and analyzes the cause of the transformer operation abnormality.
[0041] In a preferred embodiment of the present invention, the specific analysis steps for determining whether the target transformer has an operating abnormality are as follows: extracting the ratio error index, phase angle error index and no-load abnormality index of the target transformer.
[0042] The transformation ratio error index, phase angle error index and no-load abnormality index of the target transformer are accumulated and calculated according to the weights to obtain the operation abnormality index of the target transformer, which is then compared with the preset operation abnormality index threshold. If the operation abnormality index of the target transformer is greater than the operation abnormality index threshold, it is judged that the target transformer has an operation abnormality. Otherwise, it is judged that the target transformer does not have an operation abnormality.
[0043] It should be noted that the basis for setting the corresponding weights of the ratio error index, phase angle error index and no-load abnormality index is: first, according to the function and purpose of the transformer, if it is used in high-precision measurement occasions, the weights of the ratio and phase angle error index may be higher. For relay protection occasions, the weight of the phase angle error index is higher. For special applications, the weight is set according to specific needs. Secondly, considering the performance characteristics of the transformer, different types of transformers have different error characteristics. A higher weight is set for indicators with larger errors to improve the accuracy of the evaluation. At the same time, if the transformer no-load abnormality index is high, it indicates that there is a potential fault hazard, and its weight can be increased accordingly. The transformer with high stability and reliability can appropriately reduce the weight of the no-load abnormality index. In addition, the weight setting can also refer to the operating data and past experience of similar transformers.
[0044] For example, the corresponding weights of the ratio error index, the phase angle error index and the no-load abnormality index are: .
[0045] Exemplarily, the operation abnormality index threshold is .
[0046] In a preferred embodiment of the present invention, the specific analysis steps for identifying specific operating abnormalities are as follows: the transformation ratio error index, phase angle error index and no-load abnormality index of the target transformer are compared with the preset transformation ratio error index threshold, phase angle error index threshold and no-load abnormality index threshold respectively.
[0047] Exemplarily, the ratio error index threshold, the phase angle error index threshold and the no-load abnormality index threshold are .
[0048] If the transformation ratio error index of the target transformer is greater than the transformation ratio error index threshold, it is determined that the operation abnormality of the target transformer points to a transformation ratio error abnormality.
[0049] If the phase angle error index of the target transformer is greater than the phase angle error index threshold, it is determined that the operation abnormality of the target transformer is directed to a phase angle error abnormality.
[0050] If the no-load abnormality index of the target transformer is greater than the no-load abnormality index threshold, it is determined that the operation abnormality of the target transformer is directed to no-load abnormality.
[0051] It should be noted that the operation abnormality of the target transformer may point to one or more of a ratio error abnormality, a phase angle error abnormality and a no-load abnormality.
[0052] It should be noted that the present invention analyzes the operating status of the target transformer by performing ratio error, phase angle error and no-load abnormality tests when testing the operating status of the transformer. This analysis method can more comprehensively understand the operating status of the transformer and avoid the one-sidedness of single indicator analysis. A comprehensive operating status analysis of the transformer can timely discover potential hidden faults. When early signs of ratio error, phase angle error or no-load abnormality appear, appropriate measures can be taken to investigate and handle them to avoid further development of the fault, thereby improving the reliability of the transformer and the safety of the power system.
[0053] The transformer operation abnormality cause analysis module is used to analyze the evaluation of the operation abnormality cause pointed to by the target transformer operation abnormality.
[0054] The transformer abnormal operation cause analysis module includes a winding operation quality analysis unit, a core operation quality analysis unit, an external interference analysis unit and an abnormal operation cause identification unit.
[0055] It should be noted that the reasons for conducting winding operation quality analysis, core operation quality analysis and external interference analysis on the target transformer are as follows: 1. The winding is the key part of the transformer to achieve power conversion. Analyzing its operation quality can timely find out whether there are problems such as short circuit, open circuit, insulation aging, etc. in the winding. These problems will affect the transformer's transformation ratio accuracy, phase angle error and output signal stability. 2. The core plays a magnetic conduction role in the transformer, and its quality directly affects the performance of the transformer. Analyzing the operation quality of the core can detect whether the core is saturated, locally overheated, loose, etc. The saturation of the core will lead to an increase in the transformation ratio error and phase angle deviation. Local overheating may be a sign of defects or short circuits inside the core. Loose cores will affect the stability of the magnetic circuit and cause noise and vibration. 3. The transformer will be subject to various interferences from the external environment during operation, such as electromagnetic field interference, temperature changes, humidity effects, etc. These interferences may affect the measurement accuracy, stability and reliability of the transformer.
[0056] The winding operation quality analysis unit is used to obtain the winding operation quality data of the target transformer and analyze the winding operation quality of the target transformer.
[0057] In a preferred embodiment of the present invention, the winding operation quality data includes a winding insulation evaluation index and a winding polarity evaluation index.
[0058] It should be noted that the reasons for selecting the winding insulation evaluation index and the winding polarity evaluation index as the winding operation quality data are: 1. The insulation material of the group will gradually age with the extension of the use time, and the insulation performance will gradually decrease. By monitoring the winding insulation evaluation index, the trend of insulation aging can be discovered in time, and corresponding maintenance measures can be taken to extend the service life of the transformer. 2. During the installation, transportation and operation of the transformer, the winding polarity may change due to various reasons. For example, wiring errors, magnetic field interference, etc. may cause polarity reversal. By monitoring the winding polarity evaluation index, polarity changes can be discovered in time to avoid affecting the normal operation of the system due to polarity errors.
[0059] In a preferred embodiment of the present invention, the analysis of the winding operation quality of the target transformer requires the construction of the winding operation quality index of the target transformer, and the specific analysis steps are as follows: extracting the winding insulation evaluation index and the winding polarity evaluation index of the target transformer, which are respectively recorded as , .
[0060] It should be supplemented that the analysis steps of the winding insulation evaluation index are as follows: a high-definition camera is used to obtain the winding surface image of the target transformer, and then image processing software is used to obtain the area of the undamaged area of the insulation layer on the surface of the target transformer winding and the winding surface area, and the area of the undamaged area of the insulation layer on the surface of the target transformer winding and the winding surface area are calculated as a ratio to obtain the winding insulation evaluation index of the target transformer.
[0061] It should be supplemented that the analysis step of the winding polarity evaluation index is: obtaining the target transformer winding polarity connection status, judging whether there is an abnormality in the target transformer polarity connection, and if so, , otherwise .
[0062] Using the formula Analyze and obtain the winding operation quality index of the target transformer ,in They respectively represent the influencing weight factors of the target transformer winding insulation evaluation index and winding polarity evaluation index.
[0063] For example, .
[0064] The core operation quality analysis unit is used to obtain the core operation quality data of the target transformer and analyze the core operation quality of the target transformer.
[0065] In a preferred embodiment of the present invention, the core operation quality data includes a core gap compliance index and a core magnetic compliance index.
[0066] It should be noted that the reasons for selecting the core gap compliance index and the core magnetic compliance index as the target transformer core operation quality data are: 1. The size of the core gap directly affects the magnetic circuit performance of the transformer. A suitable core gap can ensure the stable transmission of magnetic flux, reduce magnetic leakage and magnetic resistance, and improve the accuracy and stability of the transformer. If the core gap does not meet the requirements, it may cause uneven magnetic circuits, increase errors, unstable output signals and other problems. 2. The core magnetic compliance index can reflect important characteristics of the core material such as magnetic permeability and saturation magnetic induction intensity. High-quality core materials have high magnetic permeability and low hysteresis loss, which can improve the efficiency and accuracy of the transformer. By monitoring the core magnetic compliance index, the quality of the core material can be evaluated to ensure that the performance of the transformer meets the design requirements.
[0067] In a preferred embodiment of the present invention, the analysis of the core operation quality of the target transformer requires the construction of the core operation quality index of the target transformer, and the specific analysis steps are as follows: extracting the core gap compliance index and the core magnetic compliance index of the target transformer, which are respectively recorded as , .
[0068] It should be added that the analysis process of the core gap compliance index of the target transformer is as follows: a three-dimensional scanning device is used to obtain the three-dimensional data of the target transformer, and then the spacing between the magnetic plates of the target transformer is obtained, and then the mean calculation is performed to obtain the monitoring magnetic plate spacing of the target transformer, and the monitoring magnetic plate spacing of the target transformer is calculated by difference with the preset reference magnetic plate spacing to obtain the magnetic plate spacing deviation value of the target transformer, and then the absolute value of the magnetic plate spacing deviation value of the target transformer is calculated by ratio with the reference magnetic plate spacing to obtain the magnetic plate spacing deviation degree of the target transformer. , and then use the formula The core gap compliance index of the target transformer is obtained by analysis .
[0069] It should be added that the analysis process of the core magnetic compliance index of the target transformer is as follows: the saturation magnetic density of the target transformer is obtained by using a magnetic permeability meter, and then compared with the preset reference saturation magnetic density to obtain the saturation magnetic density deviation of the target transformer. , and then use the formula Analyze and obtain the core magnetic compliance index of the target transformer .
[0070] Using the formula Analyze and obtain the core operation quality index of the target transformer .
[0071] The external interference analysis unit is used to obtain external interference data of the target transformer and analyze the external interference situation of the target transformer.
[0072] In a preferred embodiment of the present invention, the external interference data includes a primary voltage fluctuation evaluation index and a magnetic field strength compliance index.
[0073] It should be explained that the reasons for selecting the primary voltage fluctuation evaluation index and the magnetic field strength compliance index as the external interference data of the target transformer are: 1. The primary voltage fluctuation evaluation index is directly related to the stability of the power system. Voltage fluctuation is a common phenomenon in the power system, which may be caused by various reasons such as load changes and system failures. By monitoring and evaluating the primary voltage fluctuation, the stability of the power system can be understood in a timely manner, providing a basis for troubleshooting and system optimization. 2. The magnetic field strength compliance index is an important indicator for evaluating the transformer's ability to resist electromagnetic interference. In the power system, various electrical equipment will generate complex electromagnetic fields when in operation, which may interfere with the measurement of the transformer. By measuring and analyzing the magnetic field strength compliance index, the working performance of the transformer in a complex electromagnetic environment can be evaluated to ensure the accuracy and reliability of its measurement results.
[0074] In a preferred embodiment of the present invention, the external interference situation of the target transformer needs to be analyzed to construct the external interference index of the target transformer. The specific analysis steps are as follows: extract the primary voltage fluctuation evaluation index and magnetic field strength compliance index of the target transformer, which are recorded as , .
[0075] It needs to be supplemented that the analysis method of the primary voltage fluctuation evaluation index of the target transformer is as follows: the primary voltage data of the target transformer within a preset voltage monitoring period is extracted, and then a voltage change curve is drawn, and a number of monitoring points are evenly distributed on the curve, and the horizontal coordinate corresponding to each monitoring point is marked as a monitoring voltage, and then each monitoring voltage is compared with a preset rated voltage to obtain the monitoring voltage deviation corresponding to each monitoring point, and then the mean value is calculated to obtain the primary voltage fluctuation evaluation index of the target transformer.
[0076] The analysis method of the magnetic field strength compliance index of the target transformer refers to the analysis method of the iron core magnetic compliance index of the target transformer.
[0077] Using the formula Analyze and obtain the external interference index of the target transformer .
[0078] The abnormal operation cause identification unit is used to analyze the abnormal operation cause evaluation situation pointed out by the abnormal operation of the target transformer and provide feedback.
[0079] In a preferred embodiment of the present invention, the specific method of analyzing the evaluation of the cause of the operation abnormality pointed to by the operation abnormality of the target transformer is as follows: the winding operation quality index, the core operation quality index and the external interference index of the target transformer are compared with the pre-set winding operation quality index threshold, the core operation quality index threshold and the external interference index threshold respectively.
[0080] If the winding operation quality index of the target transformer is less than the winding operation quality index threshold, it is determined that the operation abnormality cause indicated by the operation abnormality of the target transformer is abnormal winding quality.
[0081] If the core operation quality index of the target transformer is less than the core operation quality index threshold, it is determined that the operation abnormality cause indicated by the target transformer operation abnormality is the core quality abnormality.
[0082] If the external interference index of the target transformer is greater than the external interference index threshold, it is determined that the cause of the abnormal operation pointed to by the abnormal operation of the target transformer is external interference.
[0083] It should be noted that the setting basis of the winding operation quality index threshold, the core operation quality index threshold and the external interference index threshold is: 1. The winding operation quality directly affects the performance and life of the equipment. Through the accumulation and analysis of long-term operation data, the performance change trend and fault threshold of the winding under different operating conditions can be determined. 2. Excessive core temperature will cause its mechanical strength to decrease and magnetic properties to deteriorate, which will in turn affect the operating performance of the entire equipment. Therefore, when setting the core operation quality index threshold, the mechanical strength and magnetic properties requirements of the core must be fully considered. 3. Different devices have different anti-interference capabilities. When setting the external interference index threshold, the anti-interference capability and performance requirements of the equipment must be fully considered.
[0084] Exemplarily, the winding operation quality index threshold, the core operation quality index threshold and the external interference index threshold are respectively .
[0085] It should be noted that the present invention analyzes the winding operation quality, core operation quality and external interference of the target transformer when analyzing the cause of abnormal operation of the transformer, and then identifies the specific cause of abnormal operation. This analysis method can deeply understand the working state inside the transformer, make the analysis scope more comprehensive, and avoid missing factors that may cause abnormalities. This analysis method can locate the cause of the abnormality to a specific component or link, providing a clear target for subsequent maintenance and improvement.
[0086] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.
Claims
1. A transformer operation test system based on data analysis, characterized in that: include: The ratio error test module is used to perform a ratio error test on the target transformer and analyze the ratio error of the target transformer; The phase angle error test module is used to perform a phase angle error test on the target transformer and analyze the phase angle error of the target transformer; The no-load abnormality test module is used to perform a no-load abnormality test on the target transformer and analyze the no-load abnormality of the target transformer; The transformer operation abnormality identification module is used to determine whether the target transformer has an operation abnormality. If so, it identifies the specific operation abnormality direction and analyzes the cause of the transformer operation abnormality; The transformer operation abnormality cause analysis module is used to analyze the evaluation of the operation abnormality cause pointed to by the target transformer operation abnormality; The transformer operation abnormality cause analysis module includes a winding operation quality analysis unit, a core operation quality analysis unit, an external interference analysis unit and an operation abnormality cause identification unit; The winding operation quality analysis unit is used to obtain the winding operation quality data of the target transformer and analyze the winding operation quality of the target transformer; The core operation quality analysis unit is used to obtain the core operation quality data of the target transformer and analyze the core operation quality of the target transformer; The external interference analysis unit is used to obtain external interference data of the target transformer and analyze the external interference situation of the target transformer; The abnormal operation cause identification unit is used to analyze the abnormal operation cause evaluation situation pointed out by the abnormal operation of the target transformer and provide feedback; The analysis of the no-load abnormality of the target transformer requires the construction of a no-load abnormality index of the target transformer, and the specific analysis steps are as follows: Perform multiple no-load abnormality tests on the target transformer, open the primary side of the target transformer corresponding to each no-load abnormality test, and collect the no-load current of the secondary side of the target transformer corresponding to each no-load abnormality test, recorded as ,in Indicates the number of the no-load abnormality test, , Indicates the number of no-load abnormality tests; Using the formula The no-load abnormality index of the target transformer is obtained by analysis ,in Indicates the preset no-load current threshold; The specific analysis steps for determining whether the target transformer has an operating abnormality are as follows: Extract the ratio error index, phase angle error index and no-load abnormality index of the target transformer; The transformation ratio error index, phase angle error index and no-load abnormality index of the target transformer are accumulated and calculated according to the weights to obtain the operation abnormality index of the target transformer, and then compared with the preset operation abnormality index threshold. If the operation abnormality index of the target transformer is greater than the operation abnormality index threshold, it is judged that the target transformer has an operation abnormality, otherwise, it is judged that the target transformer does not have an operation abnormality; The specific analysis steps for identifying the specific operation abnormality are as follows: The transformation ratio error index, phase angle error index and no-load abnormality index of the target transformer are compared with the preset transformation ratio error index threshold, phase angle error index threshold and no-load abnormality index threshold respectively; If the transformation ratio error index of the target transformer is greater than the transformation ratio error index threshold, it is determined that the operation abnormality of the target transformer points to the transformation ratio error abnormality; If the phase angle error index of the target transformer is greater than the phase angle error index threshold, it is determined that the operation abnormality of the target transformer is directed to a phase angle error abnormality; If the no-load abnormality index of the target transformer is greater than the no-load abnormality index threshold, it is determined that the operation abnormality of the target transformer is directed to no-load abnormality; The winding operation quality data includes a winding insulation evaluation index and a winding polarity evaluation index; The core operation quality data includes the core gap compliance index and the core magnetic compliance index; The external interference data includes a primary side voltage fluctuation evaluation index and a magnetic field strength compliance index; The analysis of the winding operation quality of the target transformer requires the construction of the winding operation quality index of the target transformer, and the specific analysis steps are as follows: Extract the winding insulation evaluation index and winding polarity evaluation index of the target transformer, which are recorded as , ; Using the formula Analyze and obtain the winding operation quality index of the target transformer ,in Respectively represent the influencing weight factors of the target transformer winding insulation evaluation index and winding polarity evaluation index; The analysis of the core operation quality of the target transformer requires the construction of the core operation quality index of the target transformer, and the specific analysis steps are as follows: Extract the core gap compliance index and core magnetic compliance index of the target transformer, which are recorded as , ; Using the formula Analyze and obtain the core operation quality index of the target transformer ; The analysis of the external interference of the target transformer requires the construction of the external interference index of the target transformer, and the specific analysis steps are as follows: Extract the primary side voltage fluctuation evaluation index and magnetic field strength compliance index of the target transformer, which are recorded as , ; Using the formula Analyze and obtain the external interference index of the target transformer .
2. A transformer operation test system based on data analysis as claimed in claim 1, characterized in that: The analysis of the target transformer's ratio error situation requires the construction of the target transformer's ratio error index, and the specific analysis steps are as follows: The target transformer is subjected to multiple ratio error tests, and a test voltage is applied to the primary side of the target transformer in each ratio error test, which is recorded as , and measure the monitoring voltage on the secondary side of the target transformer for each ratio error test, recorded as ,in Indicates the number of the ratio error test. , Indicates the number of ratio error tests; Using the formula The target transformer ratio error index is obtained by analysis. ,in Indicates the preset standard ratio.
3. A transformer operation test system based on data analysis as claimed in claim 2, characterized in that: The analysis of the phase angle error of the target transformer requires the construction of a phase angle error index of the target transformer, and the specific analysis steps are as follows: The target transformer is subjected to multiple phase angle error tests, and the phase of the primary and secondary voltages of the target transformer corresponding to each phase angle error test is measured using a phase meter, which are recorded as , ,in Indicates the number of the phase angle error test, , Indicates the number of phase angle error tests; Using the formula The phase angle error index of the target transformer is obtained by analysis. ,in Indicates the preset allowable phase angle error, Represents a natural constant.
4. The transformer operation test system based on data analysis according to claim 1, characterized in that: The specific method of evaluating the cause of the abnormal operation pointed out by the abnormal operation of the target transformer is as follows: Comparing the winding operation quality index, the core operation quality index and the external interference index of the target transformer with the preset winding operation quality index threshold, the core operation quality index threshold and the external interference index threshold respectively; If the winding operation quality index of the target transformer is less than the winding operation quality index threshold, it is determined that the operation abnormality caused by the target transformer operation abnormality is abnormal winding quality; If the core operation quality index of the target transformer is less than the core operation quality index threshold, it is determined that the cause of the target transformer operation abnormality is the core quality abnormality; If the external interference index of the target transformer is greater than the external interference index threshold, it is determined that the cause of the abnormal operation pointed to by the abnormal operation of the target transformer is external interference.